LK99 is a strange compound.
Samples with 110K superconductivity, a strange 300x resistance drop close around 250K,
no room temperature diamagnetism in this case.
Most samples turn out to be semiconductors.
First independent measurement of zero resistance in LK-99
A team of scientists from the Physics Department of Southeast University, a top university in Nanjing, China, have reported measuring 0 resistance in a sample of LK-99 they synthesized from scratch.
Here is the video:
-
@ESYudkowsky
It can perform ab initio calculations for completely novel materials and provide paths to their synthesis!
...
Oh no, it can't. And it's nowhere close.
It's just a stochastic parrot.
It's evident everywhere knowledge is sparse or computationally expensive to obtain.
Value creation engine:
Tax land, it literally pulls gold and value out of the ground.
Taxing income and capital gain has the exact opposite effect, it disincentivize work and success.
Flat band (Fermi-Hubbard) physics at the Fermi level for an ab initio DFT calculation of LK99.
It's a good clue but strong correlation calculations would be required to determine if there is a superconducting order parameter that appears.
@iris_IGB
@moke_codes
@RealAstroBit
@endless_sine
@ATinyGreenCell
Ginzburg-Landau.
Type I superconductors are diamagnetic and show Meissner effect.
The coherence length ξ >> λ magnetic penetration depth.
Type II superconductors show Meissner effect and quantum locking as magnetic flux lines thread the sample.
In that case ξ << λ.
@iris_IGB
@moke_codes
@RealAstroBit
@endless_sine
@ATinyGreenCell
Ginzburg-Landau.
Type I superconductors are diamagnetic and show Meissner effect.
The coherence length ξ >> λ magnetic penetration depth.
Type II superconductors show Meissner effect and quantum locking as magnetic flux lines thread the sample.
In that case ξ << λ.
@DahliaKurtz
Arrested yes (he did run over people), charged no (he was clearly assaulted and can defend himself).
The protesters refused medical attention, they should still be charged for assault.
@Andercot
@SamMBlau
The paper tells us that there are flat bands, which is great, but it does not tell us if there is a superconducting order parameter.
@cafreeland
Communism is a downward spiral, look at your numbers, they speak for themselves.
Taxing land is the progressive thing to do, not work and value creation.
@JustinTrudeau
Thank you for killing innovation incentives in Canada.
Can you tell us if Christia Freeland is on the list of 11 MPs colluding with foreigh agents?
99.99%+ single qubit gates and 99.9% two-qubit gates!
When two-qubit gates also get better than 99.99%, it will become practical to scale the surface code to thousands and then millions of qubits and run fault-tolerant algorithms like Shor and quantum simulations.
🤩 high fidelity 2Q gates with fluxoniums couple via transmon. As high as 99.9%🤯
Congrats
@kyle_serniak
and
@oliver_mit
!
I’ve been looking forward to it since you mentioned this at QuARC!
📃:
So hard to figure out...
Nah I am just messing with you. Of course this is a simulation. Are you kidding? A state of matter based on 27 stationary ions? Or 50 stationary LC resonators?
I am quoting Wikipedia summary of The Futurological Congress by Stanislaw Lem:
In my 2017 survey I wrote on how essentially all our post quantum public key crypto eggs are in the lattice basket. (No, I don’t know if those eggs are now broken.)
Value creation engine:
Tax land, it literally pulls gold and value out of the ground.
Taxing income and capital gain has the exact opposite effect, it disincentivize work and success.
@alanfryermedia
If the Liberals did not turn a blind eye they would have to arrest the extremists. This means they could risk losing some of their few remaining votes.
Today in QEC on the arXiv
An LDPC code using an 'effectively planar' qubit connectivity. With comparable threshold to the surface code, but 15x more qubits.
And who found this new code, that rivals Kitaev's masterpiece? Of course, it was Bravyi!
Literally right now, on a plane from Boston back to LA, I am seeing these gorgeous
#Aurora
above Toronto. This is incredible. Period.
#AbSciCon24
#AbScicon
In this talk, from July of 2018, I talk about Dowling's Law — the double exponential scaling of the power ofnear term quantum computers. Hartmut Nevin mentioned this idea in his talk nine months later, and overnight it became Nevin's Law.
I'm not bitter.
Wondering how good quantum computers need to be for certain problems?
Reminder that
@unitaryfund
keeps updated resource estimates for different advantage problems here:
DM or reply or metriq
@unitary
.fund, if you have ones to add to the chart
"Building millions of qubits will cost billions of dollars."
Well, building millions of pixels on a giant spherical screen also costs about the same.
It's totally doable.
@numberphile
*decimal* digits or *binary* digits?
800 binary digits is about 2,700 core-years, if you want 700 decimal digits you need a quantum computer.
Biased noise is easier to error correct than depolarizing noise. Hence by engineering strongly biased qubits (more T1, less T2), fault-tolerant algorithms can be achieved with far less qubits.
For example, only ~126k cat qubits could break ECC-256 in hours
@mattgurney
How do we know Freeland is not one of the 11 MPs colluding with foreign agents?
If it was only backbenchers they would have pushed them out already.
@RokoMijic
If you zoom out enough the biosphere is a state of matter that minimizes its free energy and it's globally very successful at this task. Whatever you add in it it will absorb the new component and find a lower free energy state.
@shaunmmaguire
There is even a word for this war crime: perfidy.
The feigning of civilian, non-combatant status is perfidy.
The feigning of protected status by the use of signs, emblems or uniforms of the United Nations is also perfidy.
FREE TO READ: our story on the future of quantum computing — how it works, the kinds of problems it could solve, and why it threatens a system of encryption that underpins the whole internet
w/
@samjoiner
,
@inari_ta
, and
@johnthornhillft
Chen’s paper has a bug, independently discovered by Hongxun Weng and Thomas Vidick, that he doesn’t know how to fix. If I understand correctly, in its current form the paper doesn’t yield any improvement on prior algorithms.
The logo of the Fabian society in Britain is literally a wolf in sheep's clothing.
The goal of the bourgeois society is to achieve socialism through reforms rather than revolution.
Orwell refused to join because he deemed it too authoritarian.
Congrats
@nick_c_rubin
et al. for the recent work on using
#QuantumComputing
to help advance the study of
#fusion
.
From the abstract: This resource estimate is about the same # of logical qubits as for FeMoCo, but about 100x the Toffoli gates.
#Energy
For the record, quantum computers are only good at two things ✌️:
1. Breaking public key crypto;
2. Quantum simulations.
That's it.
There is no world in which they can "process vast amount of information in parallel". 🤦♂️
🚀 Quantum Computing Revolution: AI Chatbots Like ChatGPT at Risk? 😱
Explore how quantum computers could reshape the AI landscape 🌐👇
Will the unprecedented power of quantum computing render current AI chatbots obsolete? 🤖
#BeInCrypto
@martinmbauer
The price can't be 1$ per person or the hotel would end up with -1/12$.
If the price per room with n people is 1/n! then the hotel would turn a profit.
Ludicrous.
The public key crypto of Bitcoin is the weakest you can find.
Bitcoin is mostly a silly bet that quantum computers can't be scaled to 100,000 physical qubits.
This is a reminder to secure your financial accounts as well as protect against identity theft and fraud.
Remember to:
🔒Use strong passphrases or passwords
🔒Set up multifactor authentication
🔒Keep account alerts turned on
#CybersecurityAwarenessMonth
This experiment with up to 280 physical qubits, simulating up to 48 logical qubits, seems to be the
#quantumerrorcorrection
breakthrough of the year. This is an impressive achievement, and it comes earlier than I thought it would be possible.
What Kretschmer really found is that the underlying assumptions of quantum cryptography are independent of those of classical cryptography.
Namely, even if P = NP (BQP = QMA in fact), some quantum cryptography is still possible!
🚨 YOUNG CRYPTOGRAPHER CRACKS QUANTUM ENCRYPTION CODE!
William Kretschmer, a 24-year-old American wunderkind from UC Berkeley, has reportedly made a groundbreaking discovery in quantum encryption that could potentially revolutionize data security.
His breakthrough shows that
@coingecko
Bullsh*t. Breaking Bitcoin requires closer to 100k-1M qubits, it's far easier than breaking RSA.
5-7 years is much more realistic, it's probably too late already given the upgrade will take years.
An array of 100 x 100 cat qubits could break ECC-32 in a few minutes with Shor algorithm.
Your laptop can do that as well.
Glue 10 of those arrays together and suddenly ECC-256 (a.k.a
#BITCOIN
) breaks in hours.
This is the true asymptotic exponential speedup of FTQC.